Document Detail


Extinction during evolutionary radiations: reconciling the fossil record with molecular phylogenies.
MedLine Citation:
PMID:  19659595     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Recent application of time-varying birth-death models to molecular phylogenies suggests that a decreasing diversification rate can only be observed if there was a decreasing speciation rate coupled with extremely low or no extinction. However, from a paleontological perspective, zero extinction rates during evolutionary radiations seem unlikely. Here, with a more comprehensive set of computer simulations, we show that substantial extinction can occur without erasing the signal of decreasing diversification rate in a molecular phylogeny. We also find, in agreement with the previous work, that a decrease in diversification rate cannot be observed in a molecular phylogeny with an increasing extinction rate alone. Further, we find that the ability to observe decreasing diversification rates in molecular phylogenies is controlled (in part) by the ratio of the initial speciation rate (Lambda) to the extinction rate (Mu) at equilibrium (the LiMe ratio), and not by their absolute values. Here we show in principle, how estimates of initial speciation rates may be calculated using both the fossil record and the shape of lineage through time plots derived from molecular phylogenies. This is important because the fossil record provides more reliable estimates of equilibrium extinction rates than initial speciation rates.
Authors:
Tiago B Quental; Charles R Marshall
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Publication Detail:
Type:  Journal Article     Date:  2009-07-30
Journal Detail:
Title:  Evolution; international journal of organic evolution     Volume:  63     ISSN:  1558-5646     ISO Abbreviation:  Evolution     Publication Date:  2009 Dec 
Date Detail:
Created Date:  2009-11-25     Completed Date:  2010-02-01     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0373224     Medline TA:  Evolution     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3158-67     Citation Subset:  IM    
Affiliation:
Department of Invertebrate Paleontology, Museum of Comparative Zoology, Harvard University, 26 Oxford Street, Cambridge, Massachusetts 02138, USA. tquental@oeb.harvard.edu
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MeSH Terms
Descriptor/Qualifier:
Animals
Extinction, Biological*
Fossils*
Models, Biological
Phylogeny*
Species Specificity

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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